Removed call to real parse_hw_topology
Removed call to real parse_hw_topology

- The call to PlatformImp::parse_hw_topology() in the new tests was causing
  hwloc calls to be made on various OBS platforms. These calls were
  causing some unit tests to fail intermittently. As the call to the real
  parse_hw_topology was only made to allow the PlatformImpTest.parse_topology
  test to run properly, it can be safely removed.
  PlatformImpTest.parse_topology is not run with the rest of the unit tests.
- Restructured the parse_topology test to use TestPlatformImp which will
  actually call through to the base class. This test can be run by hand on
  a supported platform.

Change-Id: I393db6e7f85e214823395183418054131393d90b
Signed-off-by: Geltz, Brad <e42f3ad4099980ea02f08e076efbee5cf9d4a803@intel.com>

geopm/geopm,cmcantalupo/geopm,geopm/geopm,geopm/geopm,cmcantalupo/geopm,sssylvester/geopm,cmcantalupo/geopm,sssylvester/geopm,sssylvester/geopm,cmcantalupo/geopm,sssylvester/geopm,geopm/geopm,cmcantalupo/geopm,geopm/geopm